Attachment for single or two thread chain over stitch producting machines



Aug. 12, 1941. E, uzz 2,252,266

ATTACHMENT FOR SINGLE OR TWO THREAD CHAIN OVER STITCH PRODUCING MACHINES Filed Dec. 7, 1939 Patented Aug. 12, 1941 UNITED star S ATN'F FF ATTACHMENT" FOR THREAD CHAENI oven s'rrron PRODUC- ING MACHINE 5d SENGLE OR TWO 1 Ciaim.

This invention relates to an attachment especially adapted for use on either a single thread chain over stitch producing machine or a two thread chain over stitch producing machine, such machines being sold by the Singer Manufacturing Company, and the present invention has for the primary object the provision of a device which may be easily installed on a machine of the character stated without alterations thereto for the purpose of permitting said machine to be employed for sewing leather goods with a blind stitch which does not appear on the right side of the leather such as hemming the Wrist portions of leather gloves with no stitching appearing on the outside of the gloves which heretofore has been entirely carried out or accomplished by hand sewing that is extremely slow work and greatly increases the cost of manufacture of such leather articles besides greatly slowing down production, wherein the present invention permits this work to be efficiently and quickly carried out by machines now in use for purposes in sewing high grade leather, but which will not produce the result desired on leather unless equipped with this invention.

With these and other objects in View, the invention consists in certain novel features of construction, combination and. arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a fragmentary side elevation showing a portion of a double thread chain over stitch producing machine equipped with the present invention or attachment.

Figure 2 is a top plan view showing the idle and feeding cups of the machine specified with the attachment applied to the idle cup.

Figure 3 is a sectional view taken on the line 3-3 of Figure 2 showing a piece of leather goods arranged for stitching on the machine of the character described and equipped with the attachment.

Figure 4 is a perspective view illustrating the attachment.

Figure 5 is an end elevation illustrating the attachment.

Figure 6 is a detail sectional View showing a piece of leather goods folded and stitched by the machine equipped with the attachment prior to unfolding of said leather goods to present a hem with a blind stitch.

Figure 7 is a fragmentarysectional viewshowing the leather goods unfolded producing the hem with the blind chain type over stitch.

Figure 8 is a fragmentary plan view'illustrating the leather goods with the hem and the chain over stitch as produced by the attachment on the type of machine specified.

Referring in detail to the drawing, the numeral 5 indicates generally a fragmentary portion of a double thread chain over stitch producing machine, the idle and feeding cups being indicated by the characters 6 and l andthe needle bythe character 8. It'is to be noted that this type of machine hasthe needle arranged for horizontal movement and moves across the space between the cups in its stitching operation. The idle cup is held in place on the machine by a set screw 9. The foregoing briefly sets forth a part of the machine of the kind specified and as stated as manufactured by the Singer Manufacturing Company. To adapt this type of machine to produce a blind stitch on leather or fabric articles such as leather gloves, it is necessary to employ thereon an attachment as indicated by the character ID. Thi attachment consists of an elongated member ll enlarged slightly at one end to form a hub l2 having a recessed bore l3 to receive the set screw 9 with the head of said screw received in the recess of the bore. The set screw seated in the recess and extending through the idle cup and secured on the support of said idle cup in the usual manner firmly secures the attachment in position on the idle cup for operation in conjunction with the horizontally operating needle 8.

The elongated member II at its end opposite the hub [2 has a bifurcation l4 defining tips l5 and I5. Also said end of the elongated member is provided with a curved bevel, as shown at ll, the bevel being located directly under the tips l5 and It. Further the elongated member II is provided with a needle groove l8 extending from the bifurcation Hi to the bore of the hub l2 and located slightly closer to one side of the elongated member than the opposite side so that the tip [5 will have a slightly greater width than the width of the tip [6. Also the top face of the tip I 6 is disposed in a plane slightly below the plane of the top face of the tip I5. The tip I5 is slightly longer than the tip I6.

By referring to Figure 3 it will be seen that the beveled face I! of the tip [6 of the member ll forms a rest and a guide for the fold formed in a piece of leather indicated by the character 19, the free edge of the leather terminating slightly above the tip [5 and resting thereagainst. The piece of leather, as shown in Figure 3, is folded manually for the purpose of forming a hem thereon and it is further noted that in folding the piece of leather, the leather is bent back upon itself twice with one of the edges of the folds resting against the beveled face I! and with the free edge of the outermost-fold resting against the edge of the tip I5. The piece of leather thus supported between the idle and feeding cups and against the attachment will be stitched with a double thread chain type over stitch, as shown in Figure 6, the threads passing through the outermost fold and over the free edge thereof and through the piece of leather where the fold thereof abuts the beveled face I! of the tip l6 of the member ll so that when the piece of leather is unfolded, as shown in Figures '7 and 8, a hem will be produced with a blind stitch of a double thread chain type over stitch heretofore only possible to obtain in leather goods by manual sewing. Consequently, the attachment as described in detail and used in conjunction with the type of machine specified permits this type of sewing to be easily and quickly carried out to reduce the cost of manufacture of leather goods such as high grade gloves where it is essential to have a hem at the wrist portion with a blind stitch. As will be seen from Figure 3 the entire face of the curved bevel I! acts as a guide and a rest for the upper edge of the folded part of the leather and the end of the tip l6 acts as a guide for preventing this edge of the fold from rising so far that the loops of threads cannot pass over the top of the same while the end of the tip l5 acts as a guide and rest for the upper free edge of the leather so that the parts are held in position so that the thread can pass through the free edge of the leather and through the upper fold and then be caused to pass over the upper edge of the fold and the upper edge of the free edge portion of the leather as shown in Figure 6, the tip l5 preventing the free edge of the leather from being pushed over the folded edge by the needle as the needle is passing through the parts.

It is believed that the foregoing description, when taken in connection with the drawing will fully set forth the construction and advantages of this invention to those skilled in the art to which such a device relates, so that further detailed description will not be required.

Having thus described the invention, what I claim is:

In a cup feed sewing machine including a pair of horizontal feed wheels and a horizontally arranged needle, a combined needle and fabric guide mounted above one of the wheels and comprising an elongated member having a needle receiving groove in its upper wall, the member at one side of the groove extending beyond the periphery of said one wheel on which the guide is mounted and being concave on its outer end for receiving and guiding a fabric fold and the end of the extended portion providing for contact therewith of a free edge of the fabric with such edge terminating above the member.

EARL LIUZZI. 

